Walkthrough part 2

This is a pretty simple objective. You have some good cover just ahead. Scope in and fire away from behind the wall and you should have no problem thinning out the enemy forces while taking minimal damage. There's also a minigun in the helicopter that can be effective, if you like.

Secure Armory and Destroy AA

You can complete these two objectives in either order. Securing the armory may be to your advantage, but it doesn't make a big difference.

You can take either alley or move along the rooftops to make your approach. Your grenade launcher should handily dispose of the vehicle guarding the armory. Once that's out of the way, clean out whatever resistance is outside, and make your way in. Expect to be ambushed inside, but the close quarters make for an easy fight if you have good reflexes. You'll find a computer terminal that you can use to secure the area.

The AA is due west on the roof of a building. It's easiest to approach from behind. Once you've made your way up to it, disposing it is just a matter of planting the charge and watching the fireworks. Easy.